US3117233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cake thickness detector for filtering apparatus
Assignee: ENVIRO-CLEAR COMPANY Inc
•
Filing: 1961-06-21
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Granted: 1964-01-07
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Expires: 1981-06-21
Abstract
No abstract record available.
Inventors
- 👤 Mittelberger Frank
- 👤 Yokell Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:05
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2371259A
Cited
US2032010A
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US2297370A
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US2476217A
Cited
US2692528A
Cited
US3025962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-06 | 1967-07-08 | 1968-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-06 | 1971-07-08 | 1972-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-06 | 1975-07-08 | 1976-01-07 | $7700.00 | Window Closed / Lapsed |